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The (t,3He) and (3He,t) reactions as probes of Gamow-Teller strength

R. G. T. Zegers·H. Akimune·Sam M. Austin·D. Bazin·A. M. van den Berg·G. P. A. Berg·B. A. Brown·A. L. Cole·I. Daito·Y. Fujita·M. Fujiwara·S. Gales·M. N. Harakeh·H. Hashimoto·R. Hayami·G. W. Hitt·M. E. Howard·M. Itoh·J. Jaenecke·T. Kawabata·K. Kawase·M. Kinoshita·T. Nakamura·K. Nakanishi·S. Nakayama·S. Okamura·W. A. Richter·D. A. Roberts·B. M. Sherrill·Y. Shimbara·M. Steiner·M. Uchida·H. Ueno·T. Yamagata·M. Yosoi
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Abstract

Charge-exchange reactions are an important tool for determining weak-interaction rates. They provide stringent tests for nuclear structure models necessary for modeling astrophysical environments such as neutron stars and core-collapse supernovae. In anticipation of (t,3He) experiments at 115 MeV/nucleon on nuclei of relevance (A~40-120) in the late evolution of stars, it is shown via a study of the 26Mg(t,3He) reaction that this probe is an accurate tool for extracting Gamow-Teller transition strengths. To do so, the data are complemented by results from the 26Mg(3He,t) reaction at 140 MeV/nucleon which allows for a comparison of T=2 analog states excited via the mirror reactions. Extracted Gamow-Teller strengths from 26Mg(t,3He) and 26Mg(3He,t) are compared with those from 26Mg(d,2He) and 26Mg(p,n) studies, respectively. A good correspondence is found, indicating probe-independence of the strength extraction. Furthermore, we test shell-model calculations using the new USD-05B interaction in the sd-model space and show that it reproduces the experimental Gamow-Teller strength distributions well. A second goal of this work is to improve the understanding of the (t,3He) and (3He,t) reaction mechanisms at intermediate energies since detailed studies are scarce. The Distorted-Wave Born Approximation is employed, taking into account the composite structures of the 3He and triton particles. The reaction model provides the means to explain systematic uncertainties at the 10-20% level in the extraction of Gamow-Teller strengths as being due to interference between Gamow-Teller dL=0, dS=1 and dL=2, dS=1 amplitudes that both contribute to transitions from 0+ to 1+ states.

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R. G. T. Zegers, H. Akimune, Sam M. Austin, D. Bazin, A. M. van den Berg, G. P. A. Berg, B. A. Brown, A. L. Cole, I. Daito, Y. Fujita, M. Fujiwara, S. Gales, M. N. Harakeh, H. Hashimoto, R. Hayami, G. W. Hitt, M. E. Howard, M. Itoh, J. Jaenecke, T. Kawabata, K. Kawase, M. Kinoshita, T. Nakamura, K. Nakanishi, S. Nakayama, S. Okamura, W. A. Richter, D. A. Roberts, B. M. Sherrill, Y. Shimbara, M. Steiner, M. Uchida, H. Ueno, T. Yamagata, M. Yosoi. 2006-03-20. The (t,3He) and (3He,t) reactions as probes of Gamow-Teller strength. https://doi.org/10.1103/physrevc.74.024309

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